He believes that as far back as 30,000 B.C., hunters may have used a system of notation, engraved on bone and stone, to mark phases of the Moon.

他认为，远在公元前30,000年以前，猎人可能会用一套刻在骨头和石头上的符号系统来标记月相。

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Ancient cultures often modified natural rock formations or built stone monuments to mark the motions of the sun and moon, charting the seasons, creating calendars and monitoring eclipses.

原始文明经常用改造天然石群或修建石碑来记录太阳和月亮的运行和季节变化，创立历法和观测日食月食。

youdao

Stone as a kind feature of moon surface, it will be a kind of obstacle to moon vehicle run.

石块作为月球表面的一种地理特征，将成为月球车行驶的障碍物。

youdao

Mr Duncan starts with a Stone Age astronomer who observed the phases of the moon, and marked them by carving notches on an eagle's bone.

ECONOMIST: Late for the date

The Taj Mahal in India has been called a poem in stone, a moon-white dream, a tear on the face of humanity.

NPR: A Pilgrimage to the Taj Mahal, a 'Poem in Stone'

These pictures will be posted on the website and used as a stepping stone for students to learn more about the Lunar surface, the history of the Moon, and potential landing sites for future Moon missions.

FORBES: NASA's GRAIL Mission Will Unlock Secrets Of The Moon's Interior